Polymer film, method of preparing the same, and flexible folding panel

Abstract

The present disclosure provides a polymer film, a method of preparing the same, and a flexible folded panel. The polymer film includes a substrate and a strengthening layer, wherein the strengthening layer includes a polymer, side chains of the polymer include a plurality of rigid segments and a plurality of flexible segments, which modify and strengthen the side chains of the polymer. The monomer of the polymer is subjected to a series of reactions, to synthesize the polymer, and the polymer film enhance hardness of a cover plate of a panel and improve the anti-friction properties and bendability.

What is claimed is: 
     
       1. A method of preparing a polymer film, comprising the following steps:
 S 100 : mixing bis(3-bromo-4-isocyanatophenyl)methane with an additive for reaction to prepare a monomer; 
 S 101 : reacting the monomer with oxalic acid to prepare a polymer; and 
 S 102 : coating the polymer on a substrate to form the polymer film, 
 wherein the monomer comprises: N,N′-(methylenebis(6-isocyanato-3,1-phenylene))bis(4-hexylnaphthalen-1-amine) or N,N′-(methylene bis(6-isocyanato-3,1-phenylene)) bis(10-octylanthracene-9-amine); and 
 the polymer has a chemical structural formula as follows: 
 
       
         
           
           
               
               
           
         
       
       wherein n is a positive integer. 
     
     
       2. The method of preparing the polymer film according to  claim 1 , wherein the additive comprises 4-hexylnaphthylamine. 
     
     
       3. The method of preparing the polymer film according to  claim 1 , wherein the step S 100  further comprises the following steps:
 S 200 : adding the bis(3-bromo-4-isocyanatophenyl)methane and 4-hexylnaphthylamine to a flask, and adding cesium carbonate, cuprous iodide and 18-crown-6 to the flask; 
 S 201 : introducing argon gas into the flask, and adding deoxygenated N,N′-dimethylpropylene urea to the flask to form a mixture, and reacting the mixture at 180° C. for 24 hours; and 
 S 202 : cooling the flask to room temperature, adding ice water to the flask, followed by extraction three times with dichloromethane, then combining organic extracts, after that, adding silica gel to the organic extracts, removing solvent from the organic extracts, and carrying out column chromatography to obtain the monomer. 
 
     
     
       4. The method of preparing the polymer film according to  claim 3 , wherein the step S 101  further comprises the following steps:
 S 300 : mixing the N,N′-(methylenebis(6-isocyanato-3,1-phenylene)) bis(4-hexylnaphthalen-1-amine) and the oxalic acid in the flask for reaction at 80° C. for 12 hours; 
 S 301 : precipitating the mixture with methanol to obtain a white solid, and then extracting the white solid in n-hexane and acetone for two days to obtain the polymer. 
 
     
     
       5. The method of preparing the polymer film according to  claim 4 , wherein the step S 300  comprises: introducing argon gas into the flask and adding diluted hydrochloric acid to the flask. 
     
     
       6. The method of preparing the polymer film according to  claim 1 , wherein the additive comprises 10-amino-9-octylanthracene. 
     
     
       7. The method of preparing the polymer film according to  claim 1 , wherein the step S 100  further comprises the following steps:
 S 400 : adding the bis(3-bromo-4-isocyanatophenyl)methane and 10-amino-9-octylanthracene to a flask; 
 S 401 : introducing argon gas into the flask, and adding deoxygenated N,N′-dimethylpropylene urea to the flask to form a mixture, and reacting the mixture at 180° C. for 24 hours; and 
 S 402 : cooling the flask to room temperature, adding ice water to the flask, followed by extraction three times with dichloromethane, then combining organic extracts, after that, adding silica gel to the flask, removing solvent from the organic extracts, and carrying out column chromatography to obtain the monomer. 
 
     
     
       8. The method of preparing the polymer film according to  claim 7 , wherein the step S 400  further comprises: adding cerium carbonate, cuprous iodide and 18-crown-6 to the flask. 
     
     
       9. The method of preparing the polymer film according to  claim 3 , wherein the step S 101  further comprises the following steps:
 S 500 : mixing the N,N′-(methylenebis(6-isocyanato-3,1-phenylene))bis(10-octylanthracene-9-amine) and the oxalic acid in a flask, and introducing argon gas and diluted hydrochloric acid for a reaction at 80° C. for 12 hours to obtain a mixture; and 
 S 501 : precipitating the mixture with methanol to obtain a white solid, and then extracting the white solid in n-hexane and acetone for two days to obtain the polymer. 
 
     
     
       10. A polymer film comprising:
 a substrate; and 
 a strengthening layer; 
 wherein the strengthening layer is disposed on the substrate, the strengthening layer comprises a polymer, and side chains of the polymer comprise a plurality of rigid segments and a plurality of flexible segments, wherein the polymer has a chemical structural formula as follows: 
 
       
         
           
           
               
               
           
         
       
       wherein n is a positive integer.